Discussing the PHP Reference & Symbol_PHP Tutorial

I generally don’t use PHP’s reference symbols when writing code. First of all, I don’t know how to use it. C language is used to get addresses, but there may be some differences in PHP. It is said to be a copy of a variable, or Just copy the same variable again, such as

$a=&$b;

Then variable a and variable b are completely equal, completely equivalent to $a=$b; so is it necessary to write $a=&$b? This may also take up more memory space

Some people like to write like this

function &f($arg1,..) {

//code body

                                                                                 }

I think writing like this has no practical effect. Generally, the reference operator is written in the parameters of the function:

function f(&$x,&$y){

// Here is the operation of $ x and $ y, that is, assigning value to $ x and $ y.

// No need to use the RETURN statement

                                                                       }

Then if function f is called, the calculated values ​​of $x and $y can be obtained directly outside the function.

$total=array();

$total_data='';

f(&$total,&$total_data);

echo $total_data; //The value of total_data calculated by the f function is output here

var_dump($total);//The value of total calculated by the f function is output here

The above is my personal opinion, I hope everyone can correct me.

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